-- +goose Up
-- +goose StatementBegin
CREATE OR REPLACE FUNCTION generate_alphanumeric_code(code_length INTEGER DEFAULT 8)
RETURNS TEXT AS $$
DECLARE
    chars TEXT := 'ABCDEFGHJKMNPQRSTUVWXYZ23456789';
    result TEXT := '';
    i INTEGER;
BEGIN
    FOR i IN 1..code_length LOOP
        result := result || substr(chars, floor(random() * length(chars) + 1)::INTEGER, 1);
    END LOOP;
    RETURN result;
END;
$$ LANGUAGE plpgsql;
-- +goose StatementEnd